Le retour est gratuit, sans frais de retour.

French often uses the definite article le/la/les to talk about something in a general sense.

So Le retour est gratuit means something like Returns are free or The return is free in a general commercial sense.

This is very common in French:

• Le tabac est interdit. = Smoking/Tobacco is prohibited.
• Le petit déjeuner est inclus. = Breakfast is included.

So Le retour here does not mean one specific return only. It means returns in general.

In this sentence, retour means the act of returning an item, especially in shopping or e-commerce.

So it refers to a customer sending a product back.

Depending on context, French can also use:

• retour = return
• renvoi = sending back / return shipment
• retourner un article = to return an item

Here, retour is the normal, natural word for a product return.

Because retour is a masculine singular noun.

• le retour → masculine singular
• so the adjective must agree: gratuit

Agreement works like this:

• masculine singular: gratuit
• feminine singular: gratuite
• masculine plural: gratuits
• feminine plural: gratuites

So:

• Le retour est gratuit.
• La livraison est gratuite.

Sans means without.

So sans frais de retour literally means without return fees.

It introduces the absence of something:

• sans problème = without a problem
• sans frais = with no fees / free of charge
• sans engagement = with no commitment

In this sentence, sans frais de retour reinforces the idea that the return costs nothing.

In French, frais is very often used in the plural when talking about costs, charges, or fees.

Examples:

• les frais de livraison = shipping costs
• les frais bancaires = bank fees
• les frais de dossier = application/processing fees

So sans frais de retour literally means without return charges/fees.

Even if English might sometimes say no return fee in the singular, French normally prefers frais in this kind of expression.

Also, frais has the same spelling in singular and plural, but in this meaning it is usually understood as plural.

The word retour appears twice because the second part specifies what kind of fees are being discussed.

• Le retour est gratuit = Returns are free.
• sans frais de retour = with no return fees.

This repetition may sound a little heavy in English, but it is very normal in French commercial language. It makes the message extra clear.

A company might do this for emphasis or legal clarity.

Yes, you could absolutely say just Le retour est gratuit.

That already means the return is free.

The added phrase sans frais de retour is mainly there to:

• emphasize the point
• remove any ambiguity
• sound more explicit in advertising or store policy language

So the full sentence is a bit redundant, but intentionally so.

The comma separates two closely related ideas:

• Le retour est gratuit
• sans frais de retour

The second part acts like an added clarification or restatement. It is similar to saying:

• Returns are free, with no return fees.

The comma is not absolutely essential in every context, but it helps the sentence read more smoothly and makes the second phrase feel like an explanation.

Gratuit is pronounced roughly like gra-twee in standard French, with the final t silent.

A rough guide:

• gratuit → gra-twee
• retour → ruh-toor (with a French r)
• frais → roughly fray

A more careful note:

• gratuit is pronounced gʁa.tɥi
• the ui sound is not exactly English wee, but gra-twee is a useful approximation for learners

Yes. In a store or website context, you will very often see:

• Retours gratuits = Free returns

That is shorter and very common in marketing.

Compared with the original sentence:

• Le retour est gratuit sounds like a full statement
• Retours gratuits sounds like a label, heading, or promotional tagline

Both are natural; they just fit slightly different styles.

Yes, there can be a nuance.

• retour is the most common word for a customer return
• renvoi focuses more on the act of sending something back

In shopping contexts, retour is generally the safer and more idiomatic choice.

So for policies like free returns, French usually prefers:

• retour gratuit
• retours gratuits
• frais de retour

rather than building everything around renvoi.